What this lesson shows
Fixes a mistake
5(9 + 3) is 5 times the sum, not 5 + (9 + 3).
The worked example
The lesson works this one step by step: 5(9 + 3). Then your kid tries one like it on paper.
The steps
- Not plus
- Write the × sign
- Parentheses first
Helping at home
A number written right against a parenthesis multiplies it: 5(9 + 3) means 5 × (9 + 3). Write the times sign in, work the parentheses first, then multiply.
If your kid gets stuck
Write the × sign you cannot see.
Watch it with Lux
With Lux, this lesson is a narrated video and a printed page your kid works on. Then Lux helps with the same math on their own worksheet, one question at a time.
Standards
- Common Core 5.OA.A.2
Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation "add 8 and 7, then multiply by 2" as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.
Matches standards in 46 statesSee each state's code
- Alabama MA19.5.1
- Alaska 5.OA.2
- Arizona 5.OA.A.2
- Arkansas 5.CAR.13
- California 5.OA.A.2
- Colorado 5.OA.A.2
- Connecticut 5.OA.A.2
- Delaware 5.OA.A.2
- District of Columbia 5.OA.A.2
- Florida MA.5.AR.2.1
- Georgia 5.NR.5.1
- Hawaii 5.OA.A.2
- Idaho 5.OA.A.2
- Illinois 5.OA.A.2
- Iowa 5.OA.A.2
- Kansas 5.OA.2
- Kentucky KY.5.OA.2
- Louisiana 5.OA.A.2
- Maine 5.OA.A.2
- Maryland 5.AT.A.2
- Massachusetts 5.OA.A.2
- Michigan 5.OA.A.2
- Mississippi 5.OA.2
- Missouri 5.RA.B.3, 5.RA.B.4
- Montana MT.5.OA.2, 5.D1.6
- Nevada 5.OA.A.2
- New Hampshire 5.OA.A.2
- New Jersey 5.OA.A.2
- New Mexico 5.OA.A.2
- New York NY-5.OA.2
- North Carolina NC.5.OA.2.b
- North Dakota 5.AR.OA.3
- Ohio 5.OA.2
- Oregon 5.OA.A.2
- Pennsylvania CC.2.2.5.A.1
- Rhode Island 5.OA.A.2
- South Carolina 5.PAFR.3.4
- South Dakota 5.OA.A.2
- Tennessee 5.OA.A.2
- Utah 5.OA.2.a, 5.OA.2.b
- Vermont 5.OA.A.2
- Virginia 5.PFA.2c, 5.PFA.2d
- Washington 5.OA.A.2
- West Virginia M.5.2
- Wisconsin M.5.OA.A.2
- Wyoming 5.OA.2